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This tire size calculator lets you check what you can replace your tires or wheels with without changing overall tire diameter or with some acceptable diameter change. The data presented here is in no way "official", please use common sense and check with manufacturer recommendations and other references.

Current Tire Size: (examples: 185/65-14, 205/75-15) How to link to this page?
Width: to Ratio: to Wheel (Rim Size): to
Max. Difference, %:
Best Matches for 155/65-14 in 14", 15".
Code Width Ratio Wheel Diameter Wall," Wall,mm Diam.Diff. = 50mph 1000miles =
155/65-14 155 65 14 21.93 3.97 100.75 0.00% 50.00 1,000.00
195/45-15 195 45 15 21.91 3.45 87.75 -0.11% 49.95 1,001.08
175/50-15 175 50 15 21.89 3.44 87.50 -0.20% 49.90 1,001.97
185/55-14 185 55 14 22.01 4.01 101.75 +0.36% 50.18 996.41
165/60-14 165 60 14 21.80 3.90 99.00 -0.63% 49.69 1,006.28
165/55-15 165 55 15 22.15 3.57 90.75 +0.97% 50.48 990.31
155/55-15 155 55 15 21.71 3.36 85.25 -1.01% 49.50 1,010.05
195/50-14 195 50 14 21.68 3.84 97.50 -1.17% 49.42 1,011.67
175/60-14 175 60 14 22.27 4.13 105.00 +1.53% 50.76 984.74
185/50-15 185 50 15 22.28 3.64 92.50 +1.60% 50.80 984.02
175/55-14 175 55 14 21.58 3.79 96.25 -1.62% 49.19 1,016.16
185/45-15 185 45 15 21.56 3.28 83.25 -1.72% 49.14 1,017.23
155/60-15 155 60 15 22.32 3.66 93.00 +1.78% 50.89 982.23
165/50-15 165 50 15 21.50 3.25 82.50 -1.99% 49.00 1,019.92
195/55-14 195 55 14 22.44 4.22 107.25 +2.33% 51.17 976.66
165/65-14 165 65 14 22.44 4.22 107.25 +2.33% 51.17 976.66
155/70-14 155 70 14 22.54 4.27 108.50 +2.78% 51.39 972.18
155/60-14 155 60 14 21.32 3.66 93.00 -2.78% 48.61 1,027.82
175/55-15 175 55 15 22.58 3.79 96.25 +2.94% 51.47 970.56
185/50-14 185 50 14 21.28 3.64 92.50 -2.96% 48.52 1,029.62
"= 50mph" - true speed when speedometer shows 50mph
"1000miles =" - odometer reading for actual 1000 miles

Click on [Show] to open charts and add wheel sizes to the matches table.
Ratio: 30 35 40 45 50 55 60 65 70 75 80 85
Wheel Size 14"  
155 155/30-14
d=17.66
w=1.83
-19.48%
155/35-14
d=18.27
w=2.14
-16.69%
155/40-14
d=18.88
w=2.44
-13.91%
155/45-14
d=19.49
w=2.75
-11.13%
155/50-14
d=20.10
w=3.05
-8.35%
155/55-14
d=20.71
w=3.36
-5.56%
155/60-14
d=21.32
w=3.66
-2.78%
155/65-14
d=21.93
w=3.97
0.00%
155/70-14
d=22.54
w=4.27
+2.78%
155/75-14
d=23.15
w=4.58
+5.56%
165 165/30-14
d=17.90
w=1.95
-18.40%
165/35-14
d=18.55
w=2.27
-15.44%
165/40-14
d=19.20
w=2.60
-12.48%
165/45-14
d=19.85
w=2.92
-9.51%
165/50-14
d=20.50
w=3.25
-6.55%
165/55-14
d=21.15
w=3.57
-3.59%
165/60-14
d=21.80
w=3.90
-0.63%
165/65-14
d=22.44
w=4.22
+2.33%
165/70-14
d=23.09
w=4.55
+5.30%
165/75-14
d=23.74
w=4.87
+8.26%
175 175/30-14
d=18.13
w=2.07
-17.32%
175/35-14
d=18.82
w=2.41
-14.18%
175/40-14
d=19.51
w=2.76
-11.04%
175/45-14
d=20.20
w=3.10
-7.90%
175/50-14
d=20.89
w=3.44
-4.76%
175/55-14
d=21.58
w=3.79
-1.62%
175/60-14
d=22.27
w=4.13
+1.53%
175/65-14
d=22.96
w=4.48
+4.67%
175/70-14
d=23.65
w=4.82
+7.81%
175/75-14
d=24.33
w=5.17
+10.95%
185 185/30-14
d=18.37
w=2.19
-16.24%
185/35-14
d=19.10
w=2.55
-12.92%
185/40-14
d=19.83
w=2.91
-9.60%
185/45-14
d=20.56
w=3.28
-6.28%
185/50-14
d=21.28
w=3.64
-2.96%
185/55-14
d=22.01
w=4.01
+0.36%
185/60-14
d=22.74
w=4.37
+3.68%
185/65-14
d=23.47
w=4.73
+7.00%
185/70-14
d=24.20
w=5.10
+10.32%
185/75-14
d=24.93
w=5.46
+13.64%
195 195/30-14
d=18.61
w=2.30
-15.17%
195/35-14
d=19.37
w=2.69
-11.67%
195/40-14
d=20.14
w=3.07
-8.17%
195/45-14
d=20.91
w=3.45
-4.67%
195/50-14
d=21.68
w=3.84
-1.17%
195/55-14
d=22.44
w=4.22
+2.33%
195/60-14
d=23.21
w=4.61
+5.83%
195/65-14
d=23.98
w=4.99
+9.33%
195/70-14
d=24.75
w=5.37
+12.83%
195/75-14
d=25.52
w=5.76
+16.33%
Wheel Size 15" [Show] [Hide]
155 155/30-15
d=18.66
w=1.83
-14.92%
155/35-15
d=19.27
w=2.14
-12.13%
155/40-15
d=19.88
w=2.44
-9.35%
155/45-15
d=20.49
w=2.75
-6.57%
155/50-15
d=21.10
w=3.05
-3.79%
155/55-15
d=21.71
w=3.36
-1.01%
155/60-15
d=22.32
w=3.66
+1.78%
155/65-15
d=22.93
w=3.97
+4.56%
155/70-15
d=23.54
w=4.27
+7.34%
155/75-15
d=24.15
w=4.58
+10.12%
165 165/30-15
d=18.90
w=1.95
-13.84%
165/35-15
d=19.55
w=2.27
-10.88%
165/40-15
d=20.20
w=2.60
-7.92%
165/45-15
d=20.85
w=2.92
-4.95%
165/50-15
d=21.50
w=3.25
-1.99%
165/55-15
d=22.15
w=3.57
+0.97%
165/60-15
d=22.80
w=3.90
+3.93%
165/65-15
d=23.44
w=4.22
+6.89%
165/70-15
d=24.09
w=4.55
+9.85%
165/75-15
d=24.74
w=4.87
+12.82%
175 175/30-15
d=19.13
w=2.07
-12.76%
175/35-15
d=19.82
w=2.41
-9.62%
175/40-15
d=20.51
w=2.76
-6.48%
175/45-15
d=21.20
w=3.10
-3.34%
175/50-15
d=21.89
w=3.44
-0.20%
175/55-15
d=22.58
w=3.79
+2.94%
175/60-15
d=23.27
w=4.13
+6.09%
175/65-15
d=23.96
w=4.48
+9.23%
175/70-15
d=24.65
w=4.82
+12.37%
175/75-15
d=25.33
w=5.17
+15.51%
185 185/30-15
d=19.37
w=2.19
-11.69%
185/35-15
d=20.10
w=2.55
-8.36%
185/40-15
d=20.83
w=2.91
-5.04%
185/45-15
d=21.56
w=3.28
-1.72%
185/50-15
d=22.28
w=3.64
+1.60%
185/55-15
d=23.01
w=4.01
+4.92%
185/60-15
d=23.74
w=4.37
+8.24%
185/65-15
d=24.47
w=4.73
+11.56%
185/70-15
d=25.20
w=5.10
+14.88%
185/75-15
d=25.93
w=5.46
+18.20%
195 195/30-15
d=19.61
w=2.30
-10.61%
195/35-15
d=20.37
w=2.69
-7.11%
195/40-15
d=21.14
w=3.07
-3.61%
195/45-15
d=21.91
w=3.45
-0.11%
195/50-15
d=22.68
w=3.84
+3.39%
195/55-15
d=23.44
w=4.22
+6.89%
195/60-15
d=24.21
w=4.61
+10.39%
195/65-15
d=24.98
w=4.99
+13.89%
195/70-15
d=25.75
w=5.37
+17.39%
195/75-15
d=26.52
w=5.76
+20.89%

Thanx:
   Mark Sink's tire calculator -- for the idea and reference numbers
   Tirerack.com -- for quick and reliable service
   Mike.S -- for inspiration :)
   XAO::Web -- for bells and whistles that allowed to create this page in about an hour

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